helpers.dbt.runner

DBTPackageRunner Objects

class DBTPackageRunner()

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A Python wrapper over a dbt package

The created wrapper minimizes the required effort to run dbt packages on datasets created with dlt. It clones the package repo and keeps it up to data, shares the dlt destination credentials with dbt and allows the isolated execution with venv parameter. The wrapper creates a dbt profile from a passed dlt credentials and executes the transformations in source_dataset_name schema. Additional configuration is passed via DBTRunnerConfiguration instance

ensure_newest_package

def ensure_newest_package() -> None

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Clones or brings the dbt package at package_location up to date.

run

def run(cmd_params: Sequence[str] = ("--fail-fast", ),
        additional_vars: StrAny = None,
        destination_dataset_name: str = None) -> Sequence[DBTNodeResult]

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Runs dbt package

Executes dbt run on previously cloned package.

Arguments:

• run_params Sequence[str], optional - Additional parameters to run command ie. full-refresh. Defaults to ("--fail-fast", ).
• additional_vars StrAny, optional - Additional jinja variables to be passed to the package. Defaults to None.
• destination_dataset_name str, optional - Overwrites the dbt schema where transformed models will be created. Useful for testing or creating several copies of transformed data . Defaults to None.

Returns:

• Sequence[DBTNodeResult] - A list of processed model with names, statuses, execution messages and execution times

  Exceptions:

• DBTProcessingError - run command failed. Contains a list of models with their execution statuses and error messages

test

def test(cmd_params: Sequence[str] = None,
         additional_vars: StrAny = None,
         destination_dataset_name: str = None) -> Sequence[DBTNodeResult]

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Tests dbt package

Executes dbt test on previously cloned package.

Arguments:

• run_params Sequence[str], optional - Additional parameters to test command ie. test selectors`.
• additional_vars StrAny, optional - Additional jinja variables to be passed to the package. Defaults to None.
• destination_dataset_name str, optional - Overwrites the dbt schema where transformed models will be created. Useful for testing or creating several copies of transformed data . Defaults to None.

Returns:

• Sequence[DBTNodeResult] - A list of executed tests with names, statuses, execution messages and execution times

  Exceptions:

• DBTProcessingError - test command failed. Contains a list of models with their execution statuses and error messages

run_all

def run_all(run_params: Sequence[str] = ("--fail-fast", ),
            additional_vars: StrAny = None,
            source_tests_selector: str = None,
            destination_dataset_name: str = None) -> Sequence[DBTNodeResult]

[view_source]

Prepares and runs a dbt package.

This method executes typical dbt workflow with following steps:

1. First it clones the package or brings it up to date with the origin. If package location is a local path, it stays intact
2. It installs the dependencies (dbt deps)
3. It runs seed (dbt seed)
4. It runs optional tests on the sources
5. It runs the package (dbt run)
6. If the dbt fails with "incremental model out of sync", it will retry with full-refresh on (only when auto_full_refresh_when_out_of_sync is set). See https://docs.getdbt.com/docs/build/incremental-models#what-if-the-columns-of-my-incremental-model-change

Arguments:

• run_params Sequence[str], optional - Additional parameters to run command ie. full-refresh. Defaults to ("--fail-fast", ).
• additional_vars StrAny, optional - Additional jinja variables to be passed to the package. Defaults to None.
• source_tests_selector str, optional - A source tests selector ie. will execute all tests from sources model. Defaults to None.
• destination_dataset_name str, optional - Overwrites the dbt schema where transformed models will be created. Useful for testing or creating several copies of transformed data . Defaults to None.

Returns:

• Sequence[DBTNodeResult] - A list of processed model with names, statuses, execution messages and execution times

  Exceptions:

• DBTProcessingError - any of the dbt commands failed. Contains a list of models with their execution statuses and error messages

• PrerequisitesException - the source tests failed

• IncrementalSchemaOutOfSyncError - run failed due to schema being out of sync. the DBTProcessingError with failed model is in args[0]

create_runner

@with_telemetry("helper", "dbt_create_runner", False, "package_profile_name")
@with_config(spec=DBTRunnerConfiguration,
             sections=(known_sections.DBT_PACKAGE_RUNNER, ))
def create_runner(venv: Venv,
                  credentials: DestinationClientDwhConfiguration,
                  working_dir: str,
                  package_location: str = dlt.config.value,
                  package_repository_branch: str = None,
                  package_repository_ssh_key: TSecretValue = TSecretValue(""),
                  package_profiles_dir: str = None,
                  package_profile_name: str = None,
                  auto_full_refresh_when_out_of_sync: bool = None,
                  config: DBTRunnerConfiguration = None) -> DBTPackageRunner

[view_source]

Creates a Python wrapper over dbt package present at specified location, that allows to control it (ie. run and test) from Python code.

The created wrapper minimizes the required effort to run dbt packages. It clones the package repo and keeps it up to data, optionally shares the dlt destination credentials with dbt and allows the isolated execution with venv parameter.

Note that you can pass config and secrets in DBTRunnerConfiguration as configuration in section "dbt_package_runner"

Arguments:

• venv Venv - A virtual environment with required dbt dependencies. Pass None to use current environment.
• credentials DestinationClientDwhConfiguration - Any configuration deriving from DestinationClientDwhConfiguration ie. ConnectionStringCredentials
• working_dir str - A working dir to which the package will be cloned
• package_location str - A git repository url to be cloned or a local path where dbt package is present
• package_repository_branch str, optional - A branch name, tag name or commit-id to check out. Defaults to None.
• package_repository_ssh_key TSecretValue, optional - SSH key to be used to clone private repositories. Defaults to TSecretValue("").
• package_profiles_dir str, optional - Path to the folder where "profiles.yml" resides
• package_profile_name str, optional - Name of the profile in "profiles.yml"
• auto_full_refresh_when_out_of_sync bool, optional - If set to True (default), the wrapper will automatically fall back to full-refresh mode when schema is out of sync
• See - https://docs.getdbt.com/docs/build/incremental-models#what-if-the-columns-of-my-incremental-model-change_description_. Defaults to None.
• config DBTRunnerConfiguration, optional - Explicit additional configuration for the runner.

Returns:

• DBTPackageRunner - A Python dbt wrapper